Method of detecting and inhibiting mobile station handoff oscill

Details Method of detecting and inhibiting mobile station handoff oscill Method of detecting and inhibiting mobile station handoff oscill

1998-05-05

1999-12-07

Chin, Wellington

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455 111, 455561, 370331, 370332, H04Q 700

Patent

active

059998148

ABSTRACT:
A method of handling oscillating mobile station handoffs between cells in a cellular telecommunications network. The method comprises the steps of detecting whether a mobile station (MS) is exhibiting an oscillating handoff pattern, determining whether the MS's signal strength with the MS's serving cell is above a safe signal strength threshold, and inhibiting handoffs of the MS upon determining that the signal strength is above the safe signal strength threshold. The oscillating handoff pattern is detected by first detecting a sequence of handoffs of the MS in which the number of handoffs is twice the number of cells involved in the handoffs, measuring an inter-handoff time period between each handoff in the sequence, and determining whether each inter-handoff time period is less than a first threshold value. This is followed by determining an oldest handoff and a latest handoff in the sequence, measuring a total oscillation time period between the oldest handoff and the latest handoff in the sequence, determining whether the total oscillation time period is less than a second threshold value, and classifying the MS as oscillating upon determining that the total oscillation time period is less than the second threshold value.

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